551661606513 has 48 divisors (see below), whose sum is σ = 828940694400. Its totient is φ = 353230606080.

The previous prime is 551661606511. The next prime is 551661606527. The reversal of 551661606513 is 315606166155.

551661606513 is a `hidden beast` number, since 5 + 5 + 16 + 61 + 60 + 6 + 513 = 666.

It is not a de Polignac number, because 551661606513 - 2¹ = 551661606511 is a prime.

It is not an unprimeable number, because it can be changed into a prime (551661606511) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 18330268 + ... + 18360338.

It is an arithmetic number, because the mean of its divisors is an integer number (17269597800).

Almost surely, 2^551661606513 is an apocalyptic number.

It is an amenable number.

551661606513 is a deficient number, since it is larger than the sum of its proper divisors (277279087887).

551661606513 is a wasteful number, since it uses less digits than its factorization.

551661606513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30822 (or 30819 counting only the distinct ones).

The product of its (nonzero) digits is 486000, while the sum is 45.

The spelling of 551661606513 in words is "five hundred fifty-one billion, six hundred sixty-one million, six hundred six thousand, five hundred thirteen".